Burner control mechanism



Aug. 30, 1932. A. R, HOEFT BURNER CONTROL MECHANISM 2 Sheets-Sheet 1 Filed Oct. 3.8. 1950 Afin.,

l 1mm@ Ada/p 222%?? Hwa@ Aug. 30, 1932. A. R. HOEFT 1,875,239

BURNER CONTROL MECHANISM Filed Oct. 1B, 1950 2 Shee's-Sheei'l 2 FP) Inder@ mdaJy g/f Patented Aug. 3Q, i932 ADQLPHVBh -IOEFT; EVANSTN, ILLNOES, ASSGNOR TO HOEFT 6c COMPANY, INC., OF CHI'CAGG, ILLINGIS, A CORFORATIN 0F ILLNOIS BURNER CONTROL MECAIQ'ISM Application filedf'ctober 18, 1930. Serial No. 83;520.

rlhis invention relates to improvements in burner control mechanisms and it consists of the matters hereinafter described and more particularly pointed out in the appended claims. *Y l l rllhe primary object of the invention is to provide a thermostatically actuated control mechanismfor aburner using` liquid fuel and Wherein-thezgravity feed of such fuel from a source' of supply is adjusted by changing the relative positions and attending` head pressures between said source of supply and the burner..

Y Anotlieriobject of the invention is to provide a controlV mechanism ofthis kind Wherein thcburner is movable up or down by al Aual-ly operated member to provide an initial adjustment and is thereafter auton'iatically movable with Vrespect to said member by meanseffected by thetemperatures produced by said burner Wherebyvthe action of the burneris controlled in a moreA efficient manner. y i f These-objectsv of the invention Vas Well as othersv together with .the many advantages thereof will more. fully appear as l proceed With-myV specification.

y vln the vdrawings l is. a top plan view of a liquid fuel burner embodying my improved control mechanism.

Eig. ,2 is a view inside elevation of the same with parts shown in longitudinal vertical section to morel fully illustrate thel invention. y

Fig. 3 is a perspective view on an enlarged scale of a part ofla certain compound lever Y embodied in my invention and which Will vIl() be more fully referred to later.

Fig. l is a longitudinal vertical sectional vievv on an enlarged scale throughy oneend 0f ,a burner embodying my invent-ion, the plane of the section being indicated bythe line Li-Zl of Fig. l.V y y Fig. 5 is a transverse vertical sectional view through the same as taken on the line 5-"5 of Figa. 'l A' Fig. 6 is a horizontal detail sectional view as talren lon the line 6 6 of Fig. l. l 'In general the. burner in which my invention is embodied is one especially adapted for use inbrooders and the like, but of course7 the same may also be embodied in burners for other purposes, Where the peculiar characteristics of the invention make it of advantage to do so. Such a burner comprises a somewhat elongated casingwith a chamber at each end and in one chamber is a vertically movable burner and in the other chamber is a liquid fuel reservoir connected to the burner by a relatively long tube. The burner is vertically movable by meansof a manually operable, compound lever including a main and an auxiliary lever member whereby said burner may be positioned to determine the desired initial head pressure for the fuel fed thereto. ln connection With saidv lever is provided a tliermostatic device which operates through the auxiliary lever member to vertically move the burner, independent of theinain lever member/to change the head pressure of the fuel in accordance With temperature conditions adjacent said burner.

Referring noW in detail to that emb diment of the invention illustrated in the aecompanyingdrawings l `indicates as a Whole anopen botten; and somewhat horizontally, elongated, sheet metal casing comprising upright, tubular, chamber providing means Q'and 3 respectively at the ends thereof, which members are connected together by a conduit ln the t t, ular member 2 is provided a spider ha an axially depending tubular stem S in which a post 7 supporting a burner 8 at its top end has sliding guided bearing. In said tubular member 2 above the spider are formed annular rows of openings 9 supplying the air necessary to support combustion and in tie tubular stem 6 of said sidere re long dinally extending slots l0 throng-gh which a tran. terse pin l1 carried by the burner post 7 elite-nds.

ln the top end of the upright tubular' member 3 is located a liquid fuel reservoir l2 which is connected to the burner by a relativelyv long feed tube l the major portion of Ll is tube being' disposed in the conduit By reason of its substantial length, said tube lief-:es to accommodate for any relative vertical movement between the burner 8 and reservoir 12. V'In this instance, it is pointed out that said reservoir is so formed as to receive and 16 to so engage the gauge and guide strip CII as to stay Where located.

lThe other endU of said lever member is bent laterally as at 17'at a point spaced from its extremity y18 and has there secured to it a similarly bent strip 19 having an extremity 20, thus providing a yoke 21 at'this end of said lever member. A pin 22 extends laterally through ,the yoke 21' and the side walls of theconduit 4 at this point to provide a pivotal connection between said lever and conduit.

Associated with this last mentioned end of Athe main lever member and coacting therewith toprovide the compound 'lever before mentioned, is asecondary or auxiliary lever member 23, pivoted at a point midway be-. tween'its ends as at'24 to andbetween the 'lever 'member and strip extremities 18 and 2O respectively;Hr One end" of said secondary -lever member isY formed to providev a fork that embraces opposite sidesof the guide tubey 6 of the lspider V5 and'has longitudinalv -slots 26 therein to receive the ends 0f the pin 11 in the burner post 7. f

V"27-'disposed in a plane4 above thatv of the V'lhe other end of said secondary lever member is twistedto pass under and engage the pivot pin for the lever yoke 19 as best shown in 3 and 4 and terminates in av finger yoke 19. It is apparent from the construction above described, that when the main levermember 14 is manually actuated to y f swing about .its pivot 22, the secondary lever member 23 swings as a part'y thereof. It is also 'apparent that `if a downward pressure 1 is exerted upon the finger 27 of the secondary lever member 23 that an upward movement is imparted to the forked end 25 thereof and due to the construction of said end of thesecondary lever member' with the burner post as before described, amovement is imparted to said post, independent of the main lever 14. In the .relative movementbetweenv the twoflever members, the pivot 22 limits the upward swingof the finger end of the secondary lever member.

i Then such a burner as described is em- Y bodied in a brooder where an even tempera.-

ture desired, such a temperature may be thermostatically controlled by operating upon the finger 27 to raise and lower the burner to change its relative position or horizontalplane with reference to thatof the reserf voir and this difference in position or plane will produce a corresponding difference in head pressure for the liquid fuel.

On the top wall of the conduit 4 above the finger 27 I providel a bowed yoke 28 secured at its ends to said wall. Depending from the center portion of said yoke is a U-sha-ped bracket 29 in the bottom of lwhich is located'a nut 30, a spring 31 being. arranged in said bracket between said nut and the yoke. A screw 32 is threaded through said nut and has a bent top end 32?L above the yoke whereby said screw may be threaded through the nut for adjustment purposes.. To. the bottom end of this screw is secured a' pair of eX- pansible' and vcontractible wafers '33 and the bottom wafer carries an'aXial stem 34 adapted f for engagement with the finger 27.

Assume nowthat the burner as a whole is f I located in an enclosure such as vabrooderrvr and that there is a fuel container 12aarrange`d in an'inverted position upon the reservoir 12. Also, assume thatthe burner 8 is in operation landthat the lever member 14 has been adj usted to position the burner in that horizon- Y talplane kwherein theY head pressure oftheV liquidfuel provides the approximately correct amount :of fuel to the'burner.

Assume that the screw 32'has been adjusted f for the temperature desired'tofbe maintainedsY` in the enclosure or brooder. kShould thectemperature Arise in said; enclosure or 4brog'ider v -ioa above the .predetermined temperature, then the wafer 33 willV expand. ,As'thenut 30'is` held down to its seat inthebracket 29 by the spring 31 the expansion of vthe wafers' through the stem321will depress the linger l' vv27 and will tiltthe secondary or auxiliaryV Yles lever membery 23 aboutits Apivotal connection V 24 with the lever member 14 and will liftfup lthe forkedends 25 ,of said lever member 23.'l By'reason of the pin and slot connection .11 x

and26 before mentioned, an upward movement V is imparted .to the burnerv post 7.and-

the burner 8 is raised into a plane above'that in which it was set by the manipulation ofthe main lever member, the position of which main lever member remains unchanged.A As the burner `is thus elevated, it changs the rfelative horizontal planes between theburner andl reservoir so that a .diiferencein head pressure V'results and the supply of fuel to the burnerY is correspondingly diminished. i

Vhenthe temperature in said enclosure kor broojder becomes reduced, the wafers 33 contract and this liftsl the stemi34i fromthev linger 27 and the burner descends by gravity, said f Vfinger being stoppedin the upward vmove- 'ment of engagementwithvthepin22. This reestablishes the original Y difference in'` elevations between the' burner and source of fuel supply as before a-ndrfeed'sanincreasedv f Y i amount of liquid fuel tothe burner. f [n this manner; the.. iuetuations. in 1 temperature in the enclosure or brooder automatically'tale care fofffthe;` feedof fuel to...the,=.burnen Itispointedf out; thatawhen the; wafers.` 33 havezactuatedtheiinger 27 to change the position of the burner, they may not immediately cease expanding and should the linger engage the lever member 14 at the rear of the yoke, this Would resist further movement of the auxiliary lever as said lever member 14 is locked by its tooth engagement with gauge strip l5. Under such conditions this further expansion Will back up so to speak and Will cause the spring 3l to compress and therefore, nothing can break in the controlling device.

It is apparent that the feed of liquid fuel to the burner is controlled by the temperature Within the enclosure or brooder, independent of the initial setting of the burner by manipulation of the lever member let.

TWhilein describing the invention, I have referred in detail to the form, arrangement and construction of the parts thereof, the same isto be considered merely as illustrative so that I do not Wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim as my invention 1. A burner control mechanism, embodying therein a burner member, a liquid fuel I. 'supply member, one of said members being movable relative to the other to vary the head pressure of said fuel fed to the burner member, manually operable means for moving said one of said members to approximately the desired position including a two-part lever and temperature responsive means operatively engaged with one of said lever parts for automatically moving said one ofksaid members independent Vof the other part of said lever of said manually operable means.

2. A burner control mechanism, embodying therein a burner member, a liquid fuel supply member, one of said members being movable relative to the other to vary the head pressure of said fuel fed to the burner member, manually operable means for moving said one ofsaid members to approximately the desired position including a two-part lever, temperature responsive means operatively engaged with one of said lever' parts for automatically moving said one of said members independent of the other part of said lever of said manually operable means and means for adjusting the action of said tem- Vvary the head vpressure of the liquid fuel fed to the burner member, a main lever member and a secondary lever member operatively -cnllectedgtoz one; .ofif said members: for mov,- inglthegsame lnto; approximately thedesired Vposit-ion 'With respect.toltheother andtem- .peratnre responsive means .operating `upon the saidisecondarfylever member; for mov.'

ing-v said"A one Jof: said members independent` of said mainileveremember;

l. A. burnercontrol mechanism,4 embodying; therein a burner-member, a liquid fuel supply f, mem-ber, one of;y said; members.; being -`verf-tically, movable Withrespeottp theY other te l va-uy the head. pressure ofthe liquid fuel fedito ithewburner member, a; main lever member-and: ay secondary lever 4memberoperatively connected to one-.off saidmembersfor movingfthe same; into approximately they desired position With.l respect to the other, tempera.- ture responsive means for i operating said secfondar-y; lever member for-moving; said: one-of saidmembers independent of saidma'inlever member andpmeansffor adjusting't-he action of saidtemperature responsive means with respect to :said-` secondary. lever member.

5 A1burnercontrol mechanism,l embody- Yingfthereina liquid fuel' reservoir, a burner connected toisaid reservoir but movable :With respect theretoto kvary thehead pressure` of liquidyfuel fed tosa-idfbur-ner, manuallyioperable means for mov-ing said; burner. with respect to, the reservoirto approximately the vdesired positionl including; a two-part leuer .and temperatureresponsive:mean-s operative- .ly engaged WithV one` ofsaid lever parts.k for automatically moving the' burner-independ- .enjtlyef'the otherlei/:erspartof` said manually operablelmeans.

6.; A. burner` control mechanism, embodying; therein a; liquid fuel reservoir, a; burner connectedftosaid reservoir-but movable with rrespect thereto to. vary the headpressure of liquidyfuel 'fed-.tov said burner, a mainilever member and a secondary lever member operatively connected tor-the-burfner, for movingthewsa-meinto. approximately the desired position with respect to the reservoirv and temiperatureresponsivemeansoperating.upon the secondary lever member, for moving said burner independent of said main levermember.-`

7?., A burnercontrol mecha-nismembodying thereina` liquid fuell reservoir, :a burner connected to said reservoir but movable With, respectrthereto! to Yvary 'the AheadY pressure of vliquid fuel; ztosaid burner, a pivoted main .lever member, a secondary vlever' membery operatively engaged with, thebufrne-r an'dzpivoted on the ymainlever member and operable tomove the 'burner into the desired approximate position with respect to the'reservoir and `rtemperature responsive means acting uponffsaijd secondary lever memberto move thewburnerindependentzof .the main lever member- 8. v In cembiinatien with a casing hiavirngY end chambers and a,conduiteonnectingsaidchamf bers,.a burner vertically kmovable in one chamof said lever `for holding it in the desired1 ad.-

ber and a Y reservoir mounted in lthe other gustedposition.

' ychamber and a reservoir mounted in the other l Y porting member.

chamber, a tubing connecting said reservoir member for movingv the burner independent i of themain lever member. f l

- 9. vIn combination 'with a casing, having end chambers and a' conduit connecting said chambers, a burner vertically movable in one chamber, a tubing connecting said reservoir and burner yandextendmg through the conduit, acompoun'd lever in-said conduit and ing thereintmftoengageand causesaid secondary'levermem'ber to move the burner independentol the main lever. f

10.l In ajburn'erl control-of the kindv described, a compound lever comprising amain vlever member lp-ivotedv at a point betweenits ends and a secondary lever member connected at a point between its ends to one endY of said mainlever member for a swinging movement Vwhichis limitedby one end ofsaid secondary lever member.'

1l. In a lburner control of the' kind'de# "scribed,'afV compound lever comprising a main lever member formed with a yoke nearone lend anda secondary lever member pivoted v to said end ofv said main lever member, one end of said secondary lever member having a finger positioned substantially above the kyoke-and the other end of said secondary lever I ,Y 'bei'nof formed -forconnection to a burner-sup-v n i 12. In combination :with a casing having Vend chambers and a conduit connecting said jchambers,a burner vertically movablerin one chamber andv areservoir mounted in the other chamber, tubing connecting-the reservoir and Y lburner, al lever arranged'in' said conduit and pivoted ata point between its endstherein, means providing an operative connection between one end ofsaid lever'andsaidburner for raising and lowering thepsameto adjust itwitli respect tothe reservoir and means 'formedy onY the chamberassociated with the reservoir for-engagement v'with the other Vend l vand burner and `extending through the Acon- Iny han In testimony` whereof, I have hereuntciset d this 15th day of October, 1930. v

ADoLPH B Honrr.- 1"',0

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